回答編集履歴
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追記
test
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@@ -11,3 +11,67 @@
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こいつら全部 複素数クラス: [std::complex<double>](https://cpprefjp.github.io/reference/complex/complex.html) で解決しそうです。
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[追記] ものは試しに書いてみた:
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```C++
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#include <iostream>
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#include <fstream>
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#include <complex>
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#include <string>
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int main() {
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std::string _9th_in =
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"3 4 3\n"
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"3\n"
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"0 0 \n"
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"1 2 \n"
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"3 4 \n";
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std::istringstream stream(_9th_in);
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double x, y, r;
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stream >> x >> y >> r;
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std::complex<double> p(x,y);
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int n;
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stream >> n;
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while ( n-- ) {
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stream >> x >> y;
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std::complex<double> q(x,y);
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double distance = std::abs(p-q); // q-p間の距離
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std::cout << p << ':' << q << " " << distance << " : "
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<< std::boolalpha << (distance < r) << std::endl;
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}
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}
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```
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